North Atlantic Oscillation Dynamics Recorded in Greenland Ice Cores

Author:

Appenzeller C.1,Stocker T. F.1,Anklin M.1

Affiliation:

1. C. Appenzeller and T. F. Stocker, Climate and Environmental Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland. M. Anklin, Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA.

Abstract

Carefully selected ice core data from Greenland can be used to reconstruct an annual proxy North Atlantic oscillation (NAO) index. This index for the past 350 years indicates that the NAO is an intermittent climate oscillation with temporally active (coherent) and passive (incoherent) phases. No indication for a single, persistent, multiannual NAO frequency is found. In active phases, most of the energy is located in the frequency band with periods less than about 15 years. In addition, variability on time scales of 80 to 90 years has been observed since the mid-19th century.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference51 articles.

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2. . The annual NAO index is defined as the normalized pressure difference between Stykkisholmur Iceland and Ponta Delgada Azores.

3. A large number of atmospheric and oceanic key quantities show variability potentially linked to the NAO. Examples are the series of cold winters in Europe in the 1960s and the variability in surface pressure in the North Atlantic [

4. Walker G. T., Bliss E. W., Mem. R. Meteorol. Soc. IV, 53 (1939);

5. Wallace J. M., Gutzler D. S., Mon. Weather Rev. 109, 784 (1981);

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